package top.jacktgq.imooc.quickStart;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

/**
 * 
 * @Title: CustomHandler.java 
 * @Package top.jacktgq.imooc 
 * @Description: 创建自定义助手类
 *                  对于请求来说相当于入站
 * @author CandyWall   
 * @date 2021年2月4日 下午7:53:14 
 * @version V1.0
 */
public class CustomHandler extends SimpleChannelInboundHandler<HttpObject> {
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        System.out.println("Channel---助手类添加");
        super.handlerAdded(ctx);
    }

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel---注册");
        super.channelRegistered(ctx);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("Channel---活跃");
        super.channelActive(ctx);
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        Channel channel = ctx.channel();
        
        if(msg instanceof HttpRequest) {
            return;
        }
        
        // 显示客户端的远程地址
        System.out.println(channel.remoteAddress());
        
        // 定义发送的数据消息
        ByteBuf content = Unpooled.copiedBuffer("Hello Netty!", CharsetUtil.UTF_8);
        
        // 构建一个Http Response
        FullHttpResponse response = 
                new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
        
        // 为响应增加数据类型和长度
        response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
        response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
        
        // 把响应刷到客户端
        ctx.writeAndFlush(response);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        System.out.println("Channel---读取完毕");
        super.channelReadComplete(ctx);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("Channel---不活跃");
        super.channelInactive(ctx);
    }

    @Override
    public void channelUnregistered(ChannelHandlerContext ctx) throws Exception {
        System.out.println("channel---取消注册");
        super.channelUnregistered(ctx);
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        System.out.println("Channel---助手类移除");
        super.handlerRemoved(ctx);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("Channel---异常捕获处理");
        super.exceptionCaught(ctx, cause);
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        System.out.println("Channel---用户事件被触发");
        super.userEventTriggered(ctx, evt);
    }

    @Override
    public void channelWritabilityChanged(ChannelHandlerContext ctx) throws Exception {
        System.out.println("Channel---可写更改");
        super.channelWritabilityChanged(ctx);
    }
}
